2. Shangshu Yu Shu records that poetry expresses ambition, songs express words, sound is eternal, law and harmony. In the early days, poetry, song, music and dance were integrated. Poetry is the lyrics. In actual performances, it is always sung with music and dance. Later, poetry, song, music and dance developed independently and became independent adults.
3. Distinguish songs from poems by entering music or not; Music is a song, but no music is a poem. Poetry is a kind of language art, which is differentiated from songs, and songs are a kind of music literature with a long history.
4. The Book of Songs is sung with music. Technically, it is a song. Because of this, The Book of Songs is regarded by scholars as a symbol of the maturity of China's music literature.